Galls

The galls are not those of males of Apiomorpha karschi, which are much smaller than those of A. strombylosa and a bit different in shape. Relative to the mid-vein of the leaves in the photos, the galls are far too big to be those of A. karschi.

Christiane, have a look at the following links -I think you have male Apiomorpha galls but A.karschi and not A.strombylosa. I wouldn't dare argue with l.cook (a Gall expert) but this might have been a simple mistake- http://agspsrv34.agric.wa.gov.au/Ento/icdb/speciescompspec.idc?mnuorder=Hemiptera&mnufamily=Eriococcidae&mnugenus=Apiomorpha http://agspsrv34.agric.wa.gov.au/Ento/images/A_karschi.jpg

interesting...poor leaves..

In fact I learned about Gall from Juan and Jonathan's some spotting on Project Noah. Then keep observing similar Galls during my trekking programs. So I mentioned my observation what I learned about Gall. In India Cluster fig tree (Ficus racemosa) is famous for Galls in its fruits and leafs.

In Galls there is small holes on opposite side.

Gall is fact Pupa like hutment of a small creature...as protective habitat from predators. Its colour also made in attractive to get rid off predators. In Galls such creatures live till transformation stage like a Pupa of butterfly.

These are galls...!! No sign of Fungi...Never seen Fungi on green leaf..!!

Galls are usually caused by an irritant, like an insect depositing it's eggs.

http://en.wikipedia.org/wiki/Gall Galls take on many different shapes--I've seen something similar to these on leaves before.

If that is a oak leaf then chances of it being galls is very high.

looks more like galls of some sort to me

could it be a fungus on a dead leaf?